Method of sand-blast carving.



F. H. SCANTLEBURY.

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APPLICATION FILED DEC. 1-,l9l5- LQUBJSQ. Patented Nov. 28, 1916.

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FRANCIS H. SCANTLEIBURY, OF NEW YORK, N. Y.

METHOD OF SAND-BLAST CARVING.

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Specification of Letters Patent.

Application filed December 4, 1915. Serial No. 65,098.

To all whom it may concern:

Be it known that I, FRANors H. SCANTLE- BURY, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and -State of New York, have invented a new and Improved Method of Sand-Blast Carving, of which the following is a full, clear,

and exact description.

My invention relates to a method of carving by sand blast, and the object thereof is to provide a more economical and inexpen-v sive method than has hitherto been employed.

In carrying out my method I cover the surface to be carved with a gelatinous coating of an adhesive character, which, when it sets, presents a compressible or yielding substance substantially immune to the sand blast, due to its compressibility, for any part of the coating attacked by the impact of the sand particles will yield and prevent the wear of said coating by the action of the sand blast. .The gelatinous coating when ready to be applied to the surface to be sand blasted is of such a consistency that it can be applied by means of a brush, and when so applied it presents an adhesive surface before it sets completely, or it may be rendered adhesive by simply wetting it after it sets. To this adhesive surface of the coating the means carrying the design to be carved on the surface may be secured by slight pressure. Generally the means carrying the design will be a sheet of paper.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a perspective sectional View of a granite block, the surface to be sand blasted being shown covered with a yielding coating; Fig. 2 is a similar View showing the sheet carrying the design secured I to the yielding coating, also showing the designcut through the paper and the yielding coating to the surface of the granite block; Fig. 3 is a perspective sectional view showing the portions of the coating where the block is to be sand blasted pealed 0E from the block; Fig. 4 is a similar view showing the block sand blasted and also the yielding coating partially pealed off from the surface of the block; and Fig. 5 is a perspective view of a granite block provided on the surface to be sand blasted with a yielding coating in which the design to be blasted is formed directly on the surface of the coating in lieu of securing the sheet thereto.

Referring to the drawings, 6 is "a granite block, the surface 7 which is to be sand blasted being covered by a gelatinous substance the consistency of which is such that it may be applied with a brush. The gelatinous substance sets and forms a yielding coating 8. A sheet of paper 9 carrying the Patented Nov. 28, 19MB.

design which is to be sand blasted is then applied to the coating 8. The coating being of adhesive character the paper may be secured thereto simply by pressure. The design on the paper is then cut through the coating by a sharp tool, and the parts of the surface 7 which are to be exposed to the sand blast are freed from the coating by peeling it off (see Fig. 3), for when the coating is set any part thereof will peel off from the surface to which it adheres when a sumciently strong pull is applied thereto. The sand blast is then applied to the entire surface. The parts of the surface covered by the coating are immune from the attack of under the impact of the sand particles.

After the carving of the surface by the sand blast is finished, the remaining part of the coating is removed by simply pulling it off (see Fig. 4:) thus exposing the parts of the surface which have been protected from the sand blast. It will be noted that my coating is removed without any scraping or washing with a solvent as is common; and due to the immunity ofthe coating to the action of the sand blast, 'a perfectly sharp cleavage is obtained between the portion of the surface treated by the sand blast and that protected by the coating. In consequence of this a better result is obtained, and more expeditiously and economically.

In lieu of applying the sheet of paper 9,

-which carries the design, to the coating 8,

coating. The rest of the method remains substantially the same.

By means of my' process the sand blasting can be done on a polished surface, for the parts of the surface rendered immune to the sand blast by the coating will not be scratched or injured in any way when removing the coating.

1 claim:

1. A process of sand-blastcarving which consists in coating the surface to be carved with a compressible or yielding coating, cutting the design to be carved through the coating, peeling ofi parts of the coating where the surface is to be sand blasted, sand blasting the surface, and then peeling oif the remaining coating to present a clean surface.

2. A process of sand-blast carving which consists in coating the surface to be carved with a compressible substance of an adhesive nature, applying the design to be carved to a the coating, cutting the design to be carved through the coating, peeling ofi parts of the coating where the surface is to be sand blasted, sand blasting the surface, and peeling ofi the remnants of the coating.

3. A process of sand-blast carvlng which consists in coating the surface to be carved with a gelatinous substance adapted to pre-- sent a compressible mass when set, applying a paper carrying the design to be carved to said coating, cutting the design through the coating, peelingolf the parts of the coating where the surface is to be sand blasted, sand blasting said surface, and peeling ofl' the remnants of the coating.

4. A process of sand-blast carving which consists in applying with a brush to the surface to be carved a gelatinous adhesive substance adapted to present a compressible mass when set, securing a sheet carrying the design to be carved to the coating, cutting the design through the coating, peeling off the parts of the coating where the surface is to be sand blasted, sand blasting the entire surface, and then peeling off the remnants of the coating to-present a clean suras face.

5. A process of sand-blast carving which through the coating,

racer/so consists in applying to the surface to be carved an adhesive substance of such a consistency that a brush may be used to apply it, said substance adapted to present a compressible mass when set, which mass can be easily cut with a sharp tool, cutting a design in the coating, coating where the surface is to be sand blasted, sand blasting the entire surface to the desired depth, and then peeling 'ofi the coating from the surface.

6. A process of sand-blast carving which consists in applying to the surface to be carved a gelatinous adhesive substance of such a consistency that a brush may be used for applying it, said substance adapted to present a compressible mass when set, which mass can be easily cut with. a sharp tool, se-

curing a sheet carrying the design to be carved to the coating, cutting out the design peeling ofl the parts of the "coating where the surface is to be sand blasted, sand blasting the entire surpeeling off the parts of the a brush may be used for ap-- face, and thenpeeling ofl' the coating from the surface.

In testimony whereof. I have signed my name to this specification 'in the presence of two subscribing witnesses.

FRANCIS H. SCANTLEBU'RY. Witnesses: I v W. A. SOANTLEBURY,

MARGARET LLOYD. 

